goja/parser/scope.go

package parser

import (
	"github.com/dop251/goja/ast"
	"github.com/dop251/goja/unistring"
)

type _scope struct {
	outer           *_scope
	allowIn         bool
	allowLet        bool
	inIteration     bool
	inSwitch        bool
	inFunction      bool
	inAsync         bool
	allowAwait      bool
	declarationList []*ast.VariableDeclaration

	labels []unistring.String
}

func (self *_parser) openScope() {
	self.scope = &_scope{
		outer:   self.scope,
		allowIn: true,
	}
}

func (self *_parser) closeScope() {
	self.scope = self.scope.outer
}

func (self *_scope) declare(declaration *ast.VariableDeclaration) {
	self.declarationList = append(self.declarationList, declaration)
}

func (self *_scope) hasLabel(name unistring.String) bool {
	for _, label := range self.labels {
		if label == name {
			return true
		}
	}
	if self.outer != nil && !self.inFunction {
		// Crossing a function boundary to look for a label is verboten
		return self.outer.hasLabel(name)
	}
	return false
}